diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp
index 7f65f1b29ee..3e1038daa9c 100644
--- a/lib/CodeGen/RegAllocLocal.cpp
+++ b/lib/CodeGen/RegAllocLocal.cpp
@@ -592,7 +592,9 @@ void RALocal::ComputeLocalLiveness(MachineBasicBlock& MBB) {
           
           // If this is a two address instr, then we don't mark the def
           // as killing the use.
-          if (last->second.first == I) {
+          if (last->second.first == I &&
+              I->getDesc().getOperandConstraint(last->second.second,
+                                                TOI::TIED_TO) == (signed)i) {
             LastUseDef[MO.getReg()] = std::make_pair(I, i);
             continue;
           }